Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 568 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
3. 3.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
5. 5.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
6. 6.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.True or false: to use daylight to read wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.True or false: to leave fridge door open wastes electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
27. 27.True or false: to leave fridge door open saves electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
39. 39.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use old filament bulbs wastes electricity. (a) True (b) False

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